MXPA96006293A - Sintet thread supply package - Google Patents

Abstract

The present invention relates to a supply package of spandex (synthetic yarn), which has the spandex wound on a cylindrical core and the rolled spandex has a lubricating finish on its surface, characterized in that for a decreased slippage of the spandex from the package, At least the last 100 meters of rolled spandex has a decreased amount of lubricant finish on its surface, compared to the average amount of surface lubricant finish on the rest of the spandex wound on the core, the amount decreased is less than a half of the amount average of such finish on the surface of the spandex rolled up in the rest of the supply pack, the at least last 100 meters of spandex wound on the core constitute the interval of 0.1 to 0.5% of the total length of the spandex wound on the pack

Description

SPANDEX SUPPLY PACKAGE BACKGROUND OF THE INVENTION Field of the Invention This invention relates to a supply package of spandex (synthetic yarn) which contains the spandex (synthetic yarn) which has a lubricating finish and is wound on a core or cylindrical center. More particularly, the invention relates to such a supply package wherein the amount of the lubricant finish on the outer windings or bends of the spandex (synthetic yarn) is considerably less than the amount of lubricious finish on the rest of the spandex wound or wound . As a result of the reduced amount of lubricant on the surface of the external windings or bends, the stability of the package, especially with respect to the slippage of the yarn from the flanges or side margins of the package during shipping and handling, is greatly reduced.

Description of the Previous Technique Spandex is a fiber manufactured in which REF: 23386 The substance that forms the fiber is a synthetic long-chain polymer comprised of at least 85% by weight of a segmented polyurethane. Most spandex is produced by dry spinning techniques and is inherently sticky enough. To prevent the adhesion of the spandex to itself when it is wrapped in a supply package, as well as to avoid other problems in the subsequent use of the spandex, the lubricating finishes, such as silicone oils, are applied to the surface of the spandex prior to winding or winding. Typically, the weight of the finish over the spandex is quantified in the range of 2 to 10% of the weight of the spandex. To form a spandex supply package, such as a coil or reel, rayon crown, flat coil, bobbin or the like, the spandex is wound onto a cylindrical core or center. The equipment for this purpose is well known. For example, US Patents 4,398,676 (Koppen et al), 3,701,490 (Wray) and 3,409,238 (Campbell et al), among others, describe an apparatus for winding high-speed spandex strands over centers or Tubular cores to form spandex supply packages. However, during the shipping and handling of such supply packages, difficulties are sometimes encountered. For example, the spandex sometimes slips off the flanges or lateral margins (ie, the spandex near the flat circular faces) of the wrapped packages. Also, if the package is held horizontally during shipping, the spandex can sometimes become unraveled (or "wasted") from the surface of the package and fall to the bottom of the shipping container. Similarly, some spandex is wasted on the floor when the package is removed from the shipping container. The slippage of the spandex from the flanges or side margins of a supply package creates time and waste consumption difficulties, especially in additional textile operations, such as folding, warping, knitting, weaving, mechanical spandex coverage, entanglement with jets of air with other threads and similar. The lubricant finishes for the spandex and the equipment for applying the spandex finish are well known. For example, U.S. Patent No. 3,296,063 (Chandler) discloses certain polysiloxanes as finishes suitable for spandex. Japanese Patent Application Publication No. 63-66073 (Maruyama et al) discloses a supply package of polyurethane elastic yarn in the form of a flat coil, in which the amount of the finish applied to the yarn depends on the apparent elongation of the thread inside the flat coil. The amount of finishing is generally less on the yarns near the center of the yarn package than on the yarns near the outside of the package. Among the numerous conventional techniques used to apply the lubricant finishes to the surfaces of the spandex thread cords in motion just prior to winding or winding in a supply package, are submersion, mordant impregnation, spraying and the like. Known devices for applying such finishes to the spandex include oiler rollers, atomizers and the like. An object of the present invention is to eliminate, or at least greatly improve, the problem of the spandex slipping out of the supply packages.

BRIEF DESCRIPTION OF THE INVENTION The present inventor found an unexpected relationship between the problem of the spandex slippage of the supply packages and the amount of lubrication over a small amount of the last hundreds of meters of the wrapped spandex on the supply package. With the discovery of this surprising relationship, the present inventor was able to satisfy the object of the invention. The prior art noted above, apparently does not recognize any relationship between the problem of slippage and the amount of lubricant finish on the spandex, and has not addressed or solved such problem.

The present invention provides a supply package of spandex (synthetic yarn), in which the spandex is wound on a center or cylindrical core and the spandex has a lubricating finish on its surface. For a reduced spandex slip from the package, at least the last hundred meters, preferably the last 500 meters, of the rolled spandex, have a decreased amount of finish on the surface, the amount is less than half the average finish amount on the surface of the spandex in the supply package. Preferably, the weight of the finish over the length of the spandex having the reduced amount of the finish, is in the range of 0.2 to 2% over the total weight of the spandex. Preferably, the length of the spand.ex having the diminished amount of the finish constitutes in the range of 0.1 to 0.5% of the total length of the wrapped spandex in the package. The invention also includes a simple method for producing the supplied spandex thread supply pack.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood by reference to the drawings which show a typical spandex supply package of the invention. In Figure 1, an isometric drawing, and in Figure 2, a side view, of the supply pack, the spandex 10 is wound on a cylindrical center or core, the tube 20. The faces 30 represent the edges of the pack.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES The following descriptions of the preferred embodiments of the invention are included for purposes of illustration and are not intended to limit the scope of the invention. The scope is defined by the appended claims. The spandex yarn supply packages come in a variety of sizes. A typical commercial spandex supply package has the spandex 10 wound helically over a cylindrical tube core 20. The core has a length L and an outside diameter, d, each 10.2 cm (4 inches). The spandex 10 forms a winding or winding unit 15, positioned centrally along the length of the core 20. The winding unit 15 has an outer diameter D of 15.2 cm (6 inches), and a height of 8.89 cm (3.5 inches). Such a typical package retains or holds 0.5 kg (1.1 pounds) of spandex. The total spandex length in such a pack, of course, depends on the denier (dtex) of the spandex. For example, a pack of 0.5 kg of spandex could contain 450,000 meters of denier 10 spandex (1.1 dtex) or "112,500 meters spandex of 40 den (44 dtex)." Typical spandex supply packages have a silicone lubricant finish on the surface of the spandex The lubricant finish nominally weighs approximately 3 to 10% of the total weight of the spandex, Typically, the finish averages about 4.5% by total weight of the spandex In accordance with the invention, the decrease in the amount of lubricant finish applied to the end portion of the spandex before it is wound onto a cylindrical element to form a package, increases the friction sufficiently so that the spandex will no longer slip off the flanges or side margins of the package. Spandex is much easier to pull through during preparation for folding, and less tangled during rewinding is observed for all downstream processing because the flanges or lateral margins are stable. This invention can be applied to all commercial spandex deniers, from 10 deniers and below up to 2240 deniers and above.

Approximately 500 to 2000 turns of reduced finish spandex are needed to stabilize the outer side of the spandex pack. The point at which the finishing supply is deactivated or removed (number of meters from the end of the package) will depend on the size (circumference) of the package and the size of the fiber. The critical portion of the package that requires stabilization is between 0.16 cm (1/16 inch) and 0.635 cm (1/4 inch) of external diameter. Larger packages and heavier deniers require thicker outer stabilization layers to achieve a satisfactory package.

EXAMPLES The results reported in these examples are believed to be representative but do not constitute all the runs that involve the indicated materials and equipment. For both of the following Examples, the conditions were: Diameter of the finishing roller: 3.81 cm (1.5 inches) (ceramic coated) rpm of the finishing roller: 3-25 rpm Surface roughness of the finishing roller: 600 rms Contact distance fiber / roller: 0.95-1.59 cm Winding speed: 883 mpm (965 ypm) Winding tension: For spandex, due to its very high elongation, this was measured as the stretch during winding. In the subsequent tests, it was 22.5%. (The amount of stretching can affect both the rewinding capacity with respect to the core and the stability of the package.A too high stretching leads to excessive compression and resultant interfiber adhesion, while too small a stretch leads to poor stability. of the package This invention improves the stability of the package without compromising the rewind capacity). Tension through the finishing roller: Enough to keep the spandex in contact with the roller, approximately 7% stretch. Package size: Finishing composition of 0.5 kg (1.1 lbs): A mixture of 96% silicone oil and 4% magnesium stearate. The percentage of Finish On Thread was determined by extracting a specimen of 91.44 meters (100 yards) weighted, of spandex with tetrachlorethylene (Perclene () which had an infrared absorbance less than 0.50 against a reference of air in a cell of 0.5 mm from a base line at 1320 cm-1 with respect to the peak of Si-CH "at approximately 1260 cm-1. A Finish Analyzer on the Thread, Model 8980, equipped with an IR Ray Detector Model DT 980 (sold by Duratech, Inc., Waynesboro, VA) is used The finish content is calculated from the IR absorbance of the Si-CH3 peak and is related to the% concentration by calibration curves. , on spandex lengths of 91.44 m (100 yards) are expressed as the percentage by weight of the fiber, the reference to the first, second, etc., describes the thread when it is removed from the package, so that the "first 91.44 meters "(" the first 100 yards ") are the most external in the package. To reduce the level of finish on the outer side of the spandex pack, the finishing roller motor is turned off or deactivated approximately 1 or 2 minutes before the package is completed, so that at 882 mpm (965 ypm) of spin speed, 882 meters (965 yards) up to 1828 meters (2000 yards) of the spandex on the outer side of the pack have reduced trim levels. The finishing roller stops its rotation instantaneously, leaving only a thin resilient film of finish on its surface; This finish is removed by the passage of the fibers, which become the outer side of the package. The finish can also be applied by other means such as an atomizer, spray, or any other method provided that the applied finish is reduced on the outer side of the package.

Example 1 Fiber: 40 denier P04G (1800): MDI: EDA / MPMD 90/10 2/4% NC0; CR-1.7; DEA terminator Additives: 1.5% Cianox * 1790 2.0% Methacrol * 2138F 0.6% Silicone oil, 3.0% ZnO, 1.5% BaSO, Finished levels measured, based on fiber weight: DICK: I'VE ASSUMED THE F0Y WAS MEASURED AFTER THE FIRST 100 YES WERE PULLED OFF AND HAVE ADDED 100 YDS TO YOUR PREVIOUS TABLE . IS THE 100YD FIGURE RIGHT? (DICK: I HAVE SUPPOSED THAT THE MATERIAL THAT REMAINED MEASURED AFTER THE FIRST 91.44 METERS (100 YARDS) WERE REMOVED BY JALADO AND I ADDED 91.44 METERS (100 YARDS) TO ITS PREVIOUS TABLE, IS THE NUMBER OF 91.44 METERS CORRECT? 100 YARDS)? 1920 meters (2100 yards) from the end: 4.5% weight 640 meters (700 yards) from the end: 4.2% weight 366 meters (400 yards) from the end: 4.0% weight 137 meters (150 yards) from the end: 1.1% weight The evaluations of the bending of the folded material (with transverse pull) on a Liba warper (sold by Liba Maschinenfabrik, Naila / Bayern, Germany,) are given later: the model of the warping and creel head of each run is listed in the table given below: Numbers 1, 2, 3 represent the packages of the invention, while A, B and C represent control packages with constant finishing levels.

Model Liba Horas man of Núnero de Punto Fileta Urdidor Skewing Slips- 1 1 6F 24E 1.7 21 A 6F 24E > 4 > 80 2 6E 23E 1.8 18 B 6E 23E 6.0 82 3 6E 24E 2.9 315 C 6E 24E 4.5 84"Notes: (1) During the passage through the creel and the pull through. (2) The loading and unpacking did not cause that the packages lose their edges or lateral margins. (3) The shipment and the unpacking caused that 27 of the packages lost their edges or lateral margins Example II: This fiber is the same except that barium sulfate was omitted. Fiber: 40 deniers P04G (1800): MDI: EDA / MPMD 90/10, 2.4% NC0; CR = 1.7; DEA terminator; Additives: 1.5% Cyanox * 1790, 2.0% Methacrol * 2138F, 0.6% silicone oil and 3.0% ZnO Finishing levels on the outer side of the package:% by weight of the finish on the yarn, as a function of the distance from the outer end of the yarn, are summarized as follows Distance (meters)% finish weight 0 - 90.52 1.2 91.44 - 181.96 1.7 182.88 - 273.40 2.4 274.32 - 364.84 2.6 365.76 - 547.72 3.2 548.64 914.40 4.3 The evaluations of the threading (pull through) of the material folded on a warper Liba are given later. The numbers 4, 5, and 6 represent the packages of the invention, while D represents a control package with a constant finishing level (4.5% by weight based on the fiber).

Model Liba Horas Hanbre de N &nero de Punto Fileta Urdidor Ensartamiento Re-atappLentos- 4 6F 24E 0.8 0 5 6F 24E 1 .7 0 6 6E 23E 0.8 0 D 6F 24E 3.5 4 Notes: Number of stitches tied to reconnect broken spandex during through-hauling.

It is noted that in relation to this date the best method known by the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Having described the invention as above, property is claimed as contained in the following

Claims (6)

R E I V I N D I C A C I O N S

1. A supply pack of spandex (synthetic yarn) having the spandex wound on a core or cylindrical core, and the spandex having a lubricating finish on its surface, characterized in that, for a decreased slippage of the spandex from the package, at least the The last 100 meters of the rolled spandex have a decreased amount of the finish on the surface, the amount is less than half the average amount of the finish on the surface of the spandex in the supply package.

2. A spandex supply package according to claim 1, characterized in that no more than the last 500 meters of spandex on the center or core have the decreased amount of finish on the surface.

3. A spandex supply pack according to claim 1 or claim 2, characterized in that the weight of the finish over the length of the spandex having the decreased amount of the finish, is in the range of 0.2 to 2% based on the weight total spandex.

4. A spandex supply pack according to claim 1 or 2, characterized in that the length of the spandex having the decreased amount of the finish constitutes in the range of 0.1 to 0.5% of the total spandex length wound on the pack.

5. A process for preparing a spandex supply package, wherein a finishing applicator applies a lubricating finish at a predetermined speed to a moving spandex thread cord and then the spandex is wound onto a cylindrical core or center, characterized in that the speed of application of the finish is decreased to less than half the predetermined speed in the last 100 to 500 meters of spandex that are rolled in the core or center.

6. A process according to claim 5, characterized in that the applicator comprises a rotating roll or finishing roller, the rotation of the roll or roller is stopped within 2000 meters of the last spandex length that are to be wound on the core or center , and while the rotation of the roller has stopped, the contact is still maintained between the spandex and the application roller.